338-378 Accumark barrels how long gone?

Has anybody shot out a 338-378 Weatherby Accumark .Weatherby says they will replace worn out barrels .I will believe it when I see it.I have about 300 rounds through my first one and just 10 through the second.Is there anything to help make barrels last longer?I have 1200 pcs of brass that will last a couple of barrels.That is the best long range rifle for the money.I dont like the Stocks on Senderos for hunting they are too wide .My 338-378 weighs 9.5 pounds with the 6.5x20 Nikon and sling about as much as I want to tote .That is the best muzzle break very loud but kills the recoil.